tools/testing/selftests/bpf/prog_tests/trace_printk.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020, Oracle and/or its affiliates. */
   3
   4 #include <test_progs.h>
   5
   6 #include "trace_printk.lskel.h"
   7
   8 #define SEARCHMSG       "testing,testing"
   9
  10 static void trace_pipe_cb(const char *str, void *data)
  11 {
  12         if (strstr(str, SEARCHMSG) != NULL)
  13                 (*(int *)data)++;
  14 }
  15
  16 void serial_test_trace_printk(void)
  17 {
  18         struct trace_printk_lskel__bss *bss;
  19         struct trace_printk_lskel *skel;
  20         int err = 0, found = 0;
  21
  22         skel = trace_printk_lskel__open();
  23         if (!ASSERT_OK_PTR(skel, "trace_printk__open"))
  24                 return;
  25
  26         ASSERT_EQ(skel->rodata->fmt[0], 'T', "skel->rodata->fmt[0]");
  27         skel->rodata->fmt[0] = 't';
  28
  29         err = trace_printk_lskel__load(skel);
  30         if (!ASSERT_OK(err, "trace_printk__load"))
  31                 goto cleanup;
  32
  33         bss = skel->bss;
  34
  35         err = trace_printk_lskel__attach(skel);
  36         if (!ASSERT_OK(err, "trace_printk__attach"))
  37                 goto cleanup;
  38
  39         /* wait for tracepoint to trigger */
  40         usleep(1);
  41         trace_printk_lskel__detach(skel);
  42
  43         if (!ASSERT_GT(bss->trace_printk_ran, 0, "bss->trace_printk_ran"))
  44                 goto cleanup;
  45
  46         if (!ASSERT_GT(bss->trace_printk_ret, 0, "bss->trace_printk_ret"))
  47                 goto cleanup;
  48
  49         /* verify our search string is in the trace buffer */
  50         ASSERT_OK(read_trace_pipe_iter(trace_pipe_cb, &found, 1000),
  51                  "read_trace_pipe_iter");
  52
  53         if (!ASSERT_EQ(found, bss->trace_printk_ran, "found"))
  54                 goto cleanup;
  55
  56 cleanup:
  57         trace_printk_lskel__destroy(skel);
  58 }